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Abstract

MLT (Mesosphere and Lower Thermosphere) temperatures were measured using ground-based instruments at two high latitude stations over several winters. Warmer temperatures in wintertime are known to arise from the large-scale hemispheric circulation that drives downwelling and upwelling in the MLT region, leading to accompanying adiabatic heating and cooling. Although a relationship between temperature and meridional wind is expected, it has not yet been properly demonstrated. The OH airglow temperatures measured with a SATI (Spectral Airglow Temperature Imager) instrument and a Michelson interferometer are compared with co-located radar wind measurements at Resolute Bay (75 degrees N, 95 degrees W) and Esrange (68 degrees N, 21 degrees E), respectively. The temperature and meridional wind have a positive relationship that is consistent with the large-scale circulation, but the zonal wind is only weakly correlated.